Do you want wider angle shots or more telefocal shots? That's poll is a question you need to answer.

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I guess it would mostly be wider angle, but i also want some distance since im gonna be taking pics of people i dont know, but i think 35mm would be fine. i was also thinking 50mm would limit me sometimes since its so zooomed in, that if i saw a car or something i like it would be too close and i would have to back off of many things to get a good shot.

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Is there much difference in entry of light between the 1.4 and the 1.8?

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2/3rds of a stop.

In any one lighting situation and any one ISO, if you can shoot wide open at f/1.4 using 1/60th sec shutter speed you would have to use 1/40th when shooting at f/1.8 to get the same exposure.

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So thats not that bad right. and btw the most i can put my is 800, i have a d40 and it gets grainy after 800 thats another thing i was thinking, with an 800 iso. i think would have to go with the 1.4, unless its barely a difference. do you think it would be much a difference?